Running into an odd issue this morning. Last night I upgraded the memory in 14 computers at one of our offices from 2 GB to 4 GB. I ran memtest on all of them to make sure all the memory was working, and then booted into Windows which saw the newly installed memory. Running XP SP3, so these machines only see ~3.5GB but they are getting upgraded to 7 x64 in a month.

Now this morning, all of these computers are unable to access the network. And if there is a local usb printer attached to a machine it is listed as being offline. This issue is only affecting the people who got the memory upgrade to 4GB.

Has anyone experienced this before or have any idea what may be causing this?

I don't know how or why, but the ports these machines were all plugged into on the switches failed. Rebooting the switches has resolved the issue. This was a serious wtf situation as not all of the machines were on the same switch. But these dumb switches are getting replaced in a month or so with some new Cisco switches.

I don't know how or why, but the ports these machines were all plugged into on the switches failed. Rebooting the switches has resolved the issue. This was a serious wtf situation as not all of the machines were on the same switch. But these dumb switches are getting replaced in a month or so with some new Cisco switches.